F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
62/3, 166/3
F25B 19/00 (2006.01) F25D 3/10 (2006.01) G01V 3/18 (2006.01) G12B 15/00 (2006.01)
Patent
CA 1147153
AN APPARATUS AND METHOD FOR MAINTAINING LOW TEMPERATURES ABOUT AN OBJECT AT A REMOTE LOCATION ABSTRACT OF THE DISCLOSURE The disclosure is directed to an apparatus and method for maintaining a body at cryogenic temperatures at a re- mote location such as down a borehole for an extended period of time. A housing contains a body comprising a material having a high specific heat at cryogenic tempera- tures such as between about 2 and 15 K. The body contains an orifice for containing an instrument or instruments operable at superconducting temperatures. The apparatus is precooled at the surface and lowered into a borehole to a desired depth, such as 2 to 3 miles. The instruments are operated, and the apparatus withdrawn, the material of the body maintaining the very low temperatures at which the instrument(s) operate for a sufficient period ot time at the remote or downhole location. The material may com- prise a rare earth compound, such as Gd203, Gd2Se3, Gd202S or GdA103. Monoclinic and C phase gadolinium oxides work well. A low temperature is maintainable at a remote location for several hours.
387436
Overton William C. Jr.
Steyert William A. Jr.
Meredith & Finlayson
United States (government Of The) Of America As Represented By T
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